Vent lock



FIG. 1 is a top plan view of a vent lock showing my new deisgn;

FIG. 2 is a front elevational view thereof;

FIG. 3 is an end elevational view thereof;

FIG. 4 is an end elevational view thereof opposite to that shown in FIG. 3;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof; and

FIG. 7 is a front elevational view thereof in an alternate position. 

The ornamental design for a vent lock, substantially as shown. 